These should fit all 77-90 Caprices and Impalas.
Although these came from an 89, they fit right on my 79 Impala.
The top hose is a different shape, but it lines up perfectly with the rad inlet and the thermostat housing.
The bottom hose is identical, and even the heater hose fits!
I know a person that has a set of these for their 84 Caprice too.

Here's a few pics:

Because these are so rare I have to get $175 for them. That includes shipping to the conus.

I also have a complete set 0f 9C1 hoses for Bubbles/Impala SS with the LT1's in them. $100 for the set.